# Scales Lexicon vs OnKey

The clearest difference is review sentiment: Scales Lexicon at 86% against OnKey's 0%. Scales Lexicon also leads on rating (5.0 vs 3.0) and price ($2.99 vs $4.99). OnKey's advantage is update cadence (every 2 months vs every 24 months) and device support (3 vs 1). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Scales Lexicon costs $2.99 and OnKey $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scales Lexicon holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 86% of Scales Lexicon's written reviews are positive against 0% of OnKey's.

Scales Lexicon ships an update every 24 months, OnKey every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Scales Lexicon | OnKey |
| --- | --- | --- |
| Price | **$2.99** | $4.99 |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/scales-lexicon/id418528535/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/onkey-scale-practice/id1638204692/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | **85.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 40 MB | 2 MB |
| Requires iOS | 26.5 | **14.1** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Patrick Q. Kelly](https://appshunter.io/developer/310068987) | [Rea Meir](https://appshunter.io/developer/1638204694) |

## What reviewers say

### Scales Lexicon

[App page](https://appshunter.io/ios/app/scales-lexicon/id418528535)

This app provides a comprehensive library of musical scales with notation and audio playback. It offers transposition for various instruments and clefs, customizable rhythmic patterns, and the ability to export notation as PDFs. Practice scales with visual feedback on highlighted notes and piano keys.

**Highlights:** Over 100 musical scales, Audio playback with visual note highlighting, Transposition for multiple instruments and clefs, Customizable rhythmic patterns and octaves, PDF export of notation, Forward and backward scale playback

**In-app purchases:** none


### OnKey

[App page](https://appshunter.io/ios/app/onkey-scale-practice/id1638204692)

This app generates readable, note-based exercises for practicing scales and chords. It's ideal for musicians of all levels looking for a focused and efficient way to improve their technique and theory knowledge without manual preparation.

**Highlights:** Generate note-based exercises, Select scale or chord type, Transpose to any key, Set range and clef, Choose from various patterns, Add note names and time signatures

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Scales Lexicon free?

Scales Lexicon costs $2.99, with no in-app purchases.

### Is OnKey free?

OnKey costs $4.99, with no in-app purchases.

### Which has better reviews, Scales Lexicon or OnKey?

Scales Lexicon is rated higher. Scales Lexicon averages 5.0 out of 5 from 5 ratings, while OnKey averages 3.0 from 2 ratings.

### Do Scales Lexicon or OnKey have ads?

Neither Scales Lexicon nor OnKey shows ads.

### Which is updated more often, Scales Lexicon or OnKey?

Scales Lexicon ships an update every 24 months, and OnKey every 2 months. Most recently, Scales Lexicon was updated on November 1, 2026 and OnKey on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*